Chapter 10 Flashcards
gene–environment interaction
situation in which the effects of genes depend on the environment in which they are expressed
-how are jeans and environmental factors and surroundings interact to shape who we are
Nature via nurture
Genetic predispositions can drive us to select and create particular environments that influence our behaviour, leading to the mistaken appearance of a pure effect of nature.
Gene expression:
Some genes “turn on” only in response to specific environmental triggers.
Epigenetics
Whether genes are active is regulated day-by-day and moment-by-moment environmental conditions.
cross-sectional design
research design that examines people of different ages at a single
point in time. In a cross-sectional design, we obtain a “snapshot” of each person at a single age; we assess some people when they’re 24, some when they’re 47, others when they’re 63, and so on. The major problem with cross-sectional designs is that they don’t control for cohort effects
cohort effect
Groups who lived during one period can differ in some systematic way from groups who lived during another period (tech-savvy)
longitudinal design
research design that examines
development in the same group of people on multiple occasions over
time. Rather than obtaining a snapshot of each person at only one point in time, we obtain the equivalent of a series of home movies taken across multiple ages. This design allows us to examine true developmental effects: changes over time within individuals as
a consequence of growing older
-costly
-time consuming
-attrition: participants dropping out of the study before it’s completed
Bidirectional Influences:
Children’s development influences their experiences, but their experiences also influence their development.
• As people age, they can increasingly select their own environments
Germinal Stage:
Zygote divides over and over again to form a blastocyst during the germinal stage – ball of identical cells early in pregnancy that haven’t yet begun to take on any specific function in a body part. The blastocyst keeps growing as
cells continue to divide for the first week and a half or so after fertilization
Embryonic Stage:
Once cells start to assume different functions, the blastocyst becomes an embryo. The embryonic stage continues from the second to the eighth week of development, during which limbs, facial features, and major organs (including the heart, lungs, and brain) begin to take
shape. During this stage, many things can go wrong in fetal development. Spontaneous
miscarriages often occur when the embryo doesn’t form properly
Fetal Stage:
By the ninth week, the major organs are established, and the heart begins to beat. This final milestone is called the fetal stage because it’s the point at which the embryo becomes a fetus. The fetus’s “job” for the rest of the pregnancy is physical maturation. The last
third of pregnancy in particular is devoted almost entirely to “bulking up.”
Brain Development
The human brain begins to develop 18 days after fertilization. Unlike most organs, which are completely formed by birth and continue to grow only in size, our brains continue to develop well into adolescence and probably even early adulthood
OBSTACLES TO NORMAL FETAL DEVELOPMENT.
1) premature birth: Premature infants are those born at fewer than 36 weeks gestation, the point in pregnancy at which infants can typically survive on their own is
around 25 weeks
(2) low birth weight: Low-birth-weight babies are defined as less than 5½ pounds (most dangerous)
3) exposure to hazardous environmental influences: Teratogens are environmental factors that can affect prenatal development negatively. They run the from drugs and alcohol to chicken pox and X-rays. Even anxiety and depression in the mother are potential teratogens because they alter the fetus’s chemical and physiological environment
fetal alcohol syndrome: a condition resulting from high levels
of prenatal alcohol exposure, causing learning disabilities and physical growth
retardation, facial malformations, and behavioral disorders
4. biological influences resulting from genetic disorders or errors in cell duplication during cell division: Genetic disruptions can be from disorders (e.g. Down Syndrome) or random errors in cell division
rooting reflex:
eating. If we softly stroke a hungry infant’s cheek, she’ll automatically
turn her head toward our hand and begin casting about with her mouth, eagerly seeking a nipple to suck. These reflexes help keep infants alive;
motor behavior
bodily motion that occurs as a result
of self-initiated force that moves the
bones and muscles (through train and error) (reaching and walking)
The major motor milestones during development include sitting up,
crawling, standing unsupported, and walking.
Factors influencing motor behaviour:
Influenced by physical maturity as well as cultural and parenting practices. Regardless of when they occur, developmental milestones are always achieved in the same sequence
Reflexes
automatic motor behaviours
Adolescence
Transition between childhood and adulthood
• Puberty (the achievement of sexual maturation resulting in the potential to reproduce) is largely due to that hormonal release
• Estrogens and androgens are present in both sexes, though the ratios are different—estrogens higher in women, androgens higher in men
• Genes and environment influence puberty onset
primary sex characteristics:
physical features such as the reproductive organs and genitals that distinguish the sexes
secondary sex characteristics
a sex-differentiating characteristic that doesn’t relate directly to reproduction, such as breast enlargement in females and deepening voices in males
Menarche
Menarche (start of menstration) and spermarche (first ejaculation)
post hoc fallacy
false assumption that because one
event occurred before another event; it must have caused that event
Theories of Cognitive Development:
- Stage-like changes in understanding (sudden spurts in knowledge, followed by periods of stability vs more continuous (smoother and gradual learning process))
- Domain general: when children learn a new cognitive skill (thinking, reasoning), it affects all areas of cognitive function vs domain-specific (children’s cognitive skills develop independently and at different rates across
different domains, such as reasoning, language, and counting.) - Principal source of learning (physical experience (moving around the world), social interaction (how parents and peers engage with them) or biological developments (innate programming of certain mental capacities)
Jean Piaget:
Piaget was a stage theorist. Jean Piaget was a psychologist who believed that children go through different stages of development, where their thinking changes in big ways. These changes happen at specific points, called transition points, followed by times when their understanding of the world becomes stable.Piaget’s theory is domain general, meaning it applies to all areas of thinking and not just one specific area. He believed that children’s thinking changes because they want to keep a balance between their experiences (what happens in the world) and their understanding of it. This balance is called equilibration.